Alexy EJ,
Zhang H.
*
Stoltz BM.
* California Institute of Technology, Pasadena and Genentech Inc., South San Francisco, USA
Catalytic Enantioselective Synthesis of Acyclic Quaternary Centers: Palladium-Catalyzed Decarboxylative Allylic Alkylation of Fully Substituted Acyclic Enol Carbonates.
J. Am. Chem. Soc. 2018;
140: 10109-10112
Key words
palladium catalysis - decarboxylative allylic alkylation - enol carbonates
Significance
The authors present the first enantioselective palladium-catalyzed decarboxylative allylic alkylation of fully substituted non-cyclic enol carbonates. The reaction delivers the linear α-quaternary ketones in excellent yields. The phosphinooxazolidine ligand controls the stereoselectivity of the reaction regardless of the Z/E geometry of the enolate starting material.
Comment
This work outlines a general method to access linear α-quaternary ketones with high enantioselectivity. A dynamic kinetic resolution of the two Z/E geometries of the enolate starting material is postulated under optimal reaction conditions, which comprise the use of an electron-deficient phosphinooxazolidine ligand.
